Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 267Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 267

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EMISSIONS
Manufacturer 's Responsibility:
Beginning with 1998 model year engines, manufacturers of all marine propulsion engines must determine the exhaust emission levels for each engine